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Operating System:
ALL
Steps To Reproduce:

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Try it in shell:
> db.test.insert({g: 1, y: {"1890" : 2, "1967" : 1, "1986" : 1, "1965" : 1)
> var yy = db.test.findOne(
{g: 1}
).y; printjson(yy); yy['1961'] = 1; printjson(yy);}}

In 2.2.0 output:
{ "1890" : 2, "1967" : 1, "1986" : 1, "1965" : 1 } { "1890" : 2, "1967" : 1, "1986" : 1, "1965" : 1, "1961" : 1 }
In 2.4.1 output
{ "1890" : 2, "1965" : 1, "1967" : 1, "1986" : 1 }
{
"1961" : 1,
"1890" : 2,
"1965" : 1,
"1967" : 1,
"1986" : 1,
"1961" : 1
}

Show
Try it in shell: > db.test.insert({g: 1, y: {"1890" : 2, "1967" : 1, "1986" : 1, "1965" : 1 ) > var yy = db.test.findOne( {g: 1} ).y; printjson(yy); yy ['1961'] = 1; printjson(yy);}} In 2.2.0 output: { "1890" : 2, "1967" : 1, "1986" : 1, "1965" : 1 } { "1890" : 2, "1967" : 1, "1986" : 1, "1965" : 1, "1961" : 1 } In 2.4.1 output { "1890" : 2, "1965" : 1, "1967" : 1, "1986" : 1 } { "1961" : 1, "1890" : 2, "1965" : 1, "1967" : 1, "1986" : 1, "1961" : 1 }
Confidence Status:
None
Work Order:
3

Shell write keys to object twice. Moreover, double keys can be stored in the database.

duplicates

SERVER-9066 Field names can be repeated in JavaScript when the same value is set multiple times